Door clamp



Apr. 10, 1923.

I. W. COBB DOOR CLAMP I Filed Feb. 12, 1921 Patented Apr. 1%, i923.

an stares ISAAC W. COBB, OF PORTLAND, MAINE.

DOOR CLAMP.

Application filed February 12, 1921. Seria1 No. 144,373.

To all whom it may concern:

Be it known that I, lsAAo W. Gone, a citizen or" the United States, residing at Portland, in the county of Cumberland and ,State of Maine, have invented certain new and useful Improvements in Door Clamps, of which the following is a specification.

My invention relates to so-called door clamps such as are used in cabinet work for drawing and holding glued and other close joints together and the object of the invention is to construct such a clamp which may be used in a great variety of positions.

These clamps are usually made with a single straight rod flat or oblong in cross section with two jaws, one of which may be locked in place in any convenient position and the other jaw forced toward it by means of a screw whereby a considerable pressure may be brought on the joint.

These clamps, as generally made, have their jaws directly opposite each other and are only operable in one plane so that while the jaws may be clamped where the surfaces acted upon are directly opposite. if the opposing surfaces of the work are not directly opposite each other they cannot be drawn together by the clamp. The important feature of my device is the mounting of the free jaw on a cylindrical rod whereby it may be turned into any given plane with relation to the opposite jaw and there clamped in posi tion.

Another important feature of my device is the formation on each of the jaws of a transverse bearing surface whereby the clamp can be set on a bench or table with the work held upward and supported by the clamp.

In the accompanying drawing, 1 have illustrated my invention as I prefer to manufacture it, although I desire it understood that various modifications and changes may be made while keeping within the terms of the appended claims.

Referring to the drawing:

Fig. 1 represents a side elevation of my clamp,

Fig. 2 represents a section on the line 1, 1 of Fig. 1 and,

Fig. 3 is a section on the line 2, 2 of Fig. 1.

Referring to the drawing:

The clamp is made up of a cylindrical rod 2 which in practice is a sect-ion of galvanized iron pipe having on one end a stop 3 which may be a cap or collar or a pin.

On the opposite end is a nut, having a hub 1 into which extends the end of the pipe 2 being there fixed and solidly secured in place.

Offset at one side from the hub e is the nut proper 5 through which passes a screw 6 extending parallel with the rod or pipe 2.

At the outer end of the screw 6 is a crank arm 7 for operating the screw and having a handle A sliding jaw 9 is provided. working adjacent to the nut 5 and having thereon a hub 1.0 through which passes the pipe 2 with an easy sliding lit so that the jaw slides readily on the rod.

An annular slotis formed in the end of the screw 6 in which fits pin 11 whereby the jaw 9 is giren a motion in either direction according to the way in which the screw is turned.

Slidable on rod 2 is the free jaw 12 having a hub 13 through which the rod freely passes. I

This free jaw 12 is constructed so as to slide readily on the rod 2 and to be turned in any radial position desired.

Means are provided for clamping the free jaw 12 in any desired position. Held in a recess next to the rod 2 is a toothed block 142 having sharpened teeth which may be forced against the rod by a cam 15 provided with a suitable handle 16.

For the purpose of resting the clamp in a position to hold small work in permanent and convenient position. I form on the nut 41 and on the free jaw a transverse shoulder 17 on the nut l and 18 on the free aw.

In Fig. 3 l have shown a piece of work 19 which has been glued and is being held in place raised into a suitable position to be left to dry.

The whole clamp is turned on its back, so to spealn and maintained in that position by the transverse ribs or shoulders 17 and 18.

It often happens. particularly in building and repairing furniture show cases and other like structures that it is desirable to place the jaws, to get a proper hold in different angles. In such cases, my clamp is of value. With the free jaw placed at any desired angle, the clamp is capable of being used with a much greater variety of work and is more generally useful than where the jaws are fixed in a single plane.

I claim 1. In a door clamp, the combination of a cylindrical rod, a nut secured to the end of the rod and oflset from the center thereof, a sliding jaw adjacent to said nut, a screw engaging said nut and acting to move said sliding jaw on the rod, a free jaw on said rod opposed to said sliding jaw, a cam on said free jaw, a toothed clamping block between the rod and the free jaw positioned to be forced against said rod by said cam to hold- 10 the jaw in any radial to the fixed jaw.

position with respect 2. In a door clamp, the combination of a cylindrical rod a nut secured to the end of the rod offset from the center thereof, a sliding jaw adjacent to said nut, a screw engaging said nut and acting to move said sliding jaw on the rod, a free jaw on said rod opposed to said sliding jaw and means for clamping said free jaw to said rod at any radial'angle with respect to the fixed jaw. 2

ISAAC W. COBB. 

